A hospital performs 3 types of operations. The first type takes 30 minutes, and they charge $900 for it. The second type takes 1 hour, and they charge $1350 for it. The third operation takes 2 hours, and they charge $1800 for it. The hospital can schedule up to 25 total operations per day. Moreover, they have 2 operating rooms, each of which can be used for 12 hours per day. Determine how many of each type of operation the hospital would perform to maximize its revenue.